Valuation And Qualifying Accounts (Details) (Allowance For Doubtful Accounts [Member], USD $) In Thousands	12 Months Ended
	Jul. 31, 2011		Jul. 31, 2010		Jul. 31, 2009
Allowance For Doubtful Accounts [Member]
Balance at Beginning of Period	$ 6,315		$ 7,387		$ 7,509
Charged to Costs and Expenses	482		1,063		1,240
Charged to Other Accounts	481	[1]	(293)	[1]	(534)	[1]
Deductions	(370)	[2]	(1,842)	[2]	(828)	[2]
Balance at End of Period	$ 6,908		$ 6,315		$ 7,387

[1] Allowance for doubtful accounts foreign currency translation losses (gains) recorded directly to equity.

[2] Bad debts charged to allowance, net of reserves and changes in estimates.